(y+3)²=2y+6

(y+3)²=2y+6
(y+3)²=2y+6

(y+3)²=2y+6
(y+3)²=2y+6
(y+3)²- 2(y+3) = 0
(y+3) (y+3-2) = 0
y = -3 或者 y = -1
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